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Ava Polzin

@avapolzin.bsky.social
1.1K followers 389 following 128 posts

professional nerd/astronomer avapolzin.github.io

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Reposted by Ava Polzin
arXiv @arxiv.bsky.social · 01/10/2026
arXiv has updated our policy on rate limiting for all submitters. This update was made to fairly distribute moderator time & support the arXiv community of staff, volunteers, readers & authors. Please read our announcement to learn more: blog.arxiv.org/2026/10/01/updated-r…
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Space Telescope Science Institute @stsci.edu · 15/09/2026
#NASARoman activated the Wide Field Instrument—a 300-megapixel infrared camera that will allow it to explore wide swaths of the cosmos quickly. This test image captures the very first photons of starlight to reach the instrument—taken as an initial performance assessment: go.nasa.gov/4rg4qEc
At the top, a grid of 21 panels shows a series of blue images with tiny neon green and yellow circles. A larger image highlights a section of the grid with circular patterns, and an inset presents a detailed star-like diffraction pattern. The colors consist of blue, green, and yellow.
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Ava Polzin @avapolzin.bsky.social · 11/09/2026
I completely agree (many of the astronomy-specific tells are all over my own writing) and given the frequency with which my co-authors who also don't use LLMs use these words, I feel fairly confident that their selection is dubious at best. Seems a good way to arbitrarily discount people's writing.
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Jeremy Bailin @astrobailin.bsky.social · 30/08/2026
Roman launch transits the sun. From NASASpaceflight feed.
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Ava Polzin @avapolzin.bsky.social · 18/08/2026
Best of all, we're making data and catalogs public as we publish :) See questdwarfs.github.io for more! 6/6
questdwarfs.github.io
QUEST Dwarfs
Quasars to Understand Environment around, and STar formation in, Dwarfs
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Ava Polzin @avapolzin.bsky.social · 18/08/2026
Just 20% of our sample represents a significant increase in the number of dwarfs with CGM measurements at <1/3 Rvir, and we've studied the galaxies in detail so that we can integrate our understanding of galaxies' stellar pops, ISM, and CGM, taking a holistic approach to the baryon cycle. 5/
The phase space of galaxy stellar mass vs. virial radius-normalized project distance to the CGM sightline for dwarf galaxies outside of the Local Group. Gray points are from the literature, and blue points are the just 20% of the overall QUEST Dwarfs program presented in this initial paper.
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Ava Polzin @avapolzin.bsky.social · 18/08/2026
(3) and preliminary analysis of "low-mass" (log Mstar/Msun < 8) and "high-mass" (log Mstar/Msun >= 8) bins suggest that the cool CGM holds ~3% and ~16% respectively of the metals produced by the galaxies (I don't have a good standalone figure for this one...) 4/
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Ava Polzin @avapolzin.bsky.social · 18/08/2026
(2) consistent with simulations, galaxy stellar mass sets the normalization of the CGM density profile, with more massive galaxies also having higher metal column densities, 3/
The "total" Si column density (for galaxies which have the full suite of Si II, Si III, and Si IV), the leftmost panel is colored by stellar mass, the center panel by log sSFR_Ha/sSFR_FUV, and the rightmost panel by gas-phase metallicity.
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Ava Polzin @avapolzin.bsky.social · 18/08/2026
(1) chemically enriched gas in the circumgalactic medium is multiphase and concentrated toward galaxies, with lower ionization species the most concentrated and higher ionization species more extended, 2/
Ion-by-ion measurements of the column density of H I, Si II, C II, Si III, Si IV, C IV in dwarf galaxies outside the Local Group as a function of virial-radius normalized impact parameter. Points are colored by mass and the red points (for higher mass galaxies) are all above the blue points (for lower mass galaxies).
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Ava Polzin @avapolzin.bsky.social · 18/08/2026
Paper day! First results from our QUEST Dwarfs program to integrate study of the baryon cycle in low-mass galaxies is on arXiv. arxiv.org/abs/2608.15782 With co-author on bsky @highzclouds.bsky.social From just the first 20% of the sample we find ... 1/ 🧪🔭☄️
14 panels showing individual galaxies on ~20 kpc scales. The spectroscopic aperture (slit, fiber, or IFU) is shown, and stars (or arrows, where the QSO is off of the screen) show background sightlines used to probe the galaxies' circumgalactic media.
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Derek Lowe @dereklowe.bsky.social · 23/07/2026
Thoughts on the various Trump administration proposals to revamp US science funding - and what they all have in common:
science.org
The Assault On Science Funding Continues
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Carl T. Bergstrom @carlbergstrom.com · 23/07/2026
1. The new Trump / Kratsios plan for US science appears explicitly designed to destroy US universities. Diverting money to tech donors is probably just a bonus. Gift link.
nytimes.com
Trump’s Plan for Science: More Money for A.I., Less for Universities (Gift Article)
Michael Kratsios, President Trump’s science adviser, proposed overhauling how the government funds research. Democrats said Mr. Trump’s actions had weakened science.
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Ava Polzin @avapolzin.bsky.social · 11/07/2026
Drinking game idea: take a shot every time I begin an answer with “yes, absolutely” 😅 But in all seriousness, I had a great time talking with @startswithabang.bsky.social about holistic study of the processes that govern galaxy evolution on his fantastic podcast!
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Kevin 👽 @astro-kevin.com · 10/07/2026
No serious person with any interest in the wellbeing of our species would ever consider approving this monstrosity of a constellation.
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Michael Busch @michael-w-busch.bsky.social · 10/07/2026
It remains way past time to stop letting corporations unilaterally make a mess of the sky. Require regulators that actually do that, United States. Instead of regulators that let dangerous scams like this go forwards on the basis of blatant nonsense. uk.pcmag.com/news/166087/...
uk.pcmag.com
FCC Approves Reflect Orbital's Giant Mirror Satellite That Astronomers Hate
The FCC says the most controversial aspect of Reflect Orbital's Earendil-1 satellite, the giant mirror, falls out of its purview since the regulator mainly focuses on radio spectrum.
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Kat Abughazaleh @katmabu.bsky.social · 05/07/2026
Hey @chicagotribune.com Editorial Board: Why did you describe me as a “bomb-throwing influencer”? This is wrong, inflammatory, and racist. Change it. www.chicagotribune.com/2026/07/05/e...
So far, the Democratic Socialists of America's success has been confined in large part to deep-blue city districts. Meanwhile, in suburban areas and in statewide contests establishment Democrats generally are winning against progressive challengers. Chicago saw its own version of this dynamic in March in the hotly contested and crowded race to succeed retiring Rep. Jan Schakowsky in the 9th Congressional District. The bomb-throwing influencer Kat Abughazaleh, 27, won the portions of that district in Chicago's North Side lakefront neighborhoods, but suburban votes gave savvy
Evanston Mayor Daniel Biss the win.
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derek guy @dieworkwear.bsky.social · 01/07/2026
Justice Brown Jackson's argument for birthright citizenship is very moving. I recommend reading it in full. An excerpt with alt-text below. “The Reconstruction Amendments were an anticaste, antisubordination reset for the Nation, not a mere spot treatment for the dark stain of slavery.” — KBJ
Still, most freed Blacks resisted the pressure to self-deport. Instead, many started organizing toward the creation of the kind of Nation the colonizationists opposed—one that guaranteed liberty and justice for all. In the decades leading up to the ratification of the Fourteenth Amendment, Black Americans organized and gathered at more than 600 local and national conventions across the country. There, delegates erected the political and intellectual scaffolding for the Fourteenth Amendment and, later, for the Black Civil Rights Movement more generally. 

Critically for present purposes, these visionaries already understood themselves to be American citizens. “The refrains ‘we are Americans’ and ‘we are citizens’ echoed in conferences throughout the North.” Moreover, “[b]irthright figured importantly” as “delegates frequently characterized their status as that of native-born citizens.” The delegates argued that, as such, they had the requisite allegiance, so, at a minimum, the Federal Government owed them the duty of protection. 

The famed orator Frederick Douglass was one of these delegates. Capturing the spirit of the moment, Douglass proclaimed that Chief Justice Taney—the author of the majority opinion in Dred Scott v. Sandford, 19 How. 393 (1857)—“[could] do many things, but he [could not] … change the essential nature of things.” In the absence of the artificial evils of slavery and racial subordination, Douglass explained, “the glorious birthright of our common humanity, will become the inheritance of all the inhabitants of this highly favored country.”

Do note this: The citizenship thesis of the Colored Conventions was thus not that some new status should be created and conferred on freed Blacks.It was instead that freed Blacks already had a rightful claim to citizenship because they had been born on American soil. After all, the Nation, from its founding, had “boldly proclaim[ed] that all men are born free and equal, and that consequently life, liberty, and the pursuit of happiness, are inherent in every individual, vested inalienably by natural birthright.” No ideal was more inherently American. Now, “rest[ing their] cause on the republican standard of the revolutionary Fathers,” freed Blacks were “knock[ing] at the doors of the constitution and demand[ing] an entrance.” And “[i]f … asked what evidence [they] bring to sustain [their] qualifications for citizenship, [they would] offer them certificates of … BIRTH and NATIVITY.” Would the Nation live up to its promise?

Such universalist appeals were a conscious choice. Yes, Black Americans had suffered a singular wrong. And yes, they had “fought and bled” for the Union, paying a steep price for their freedom. But the delegates did not rest on these laurels. Rather, they drew upon the moral and political force of the universal principles that were already core to the Nation’s identity.

That bears repeating: Freed Blacks did not advocate for a unique set of rules that catered only to their situation. Nor did they seek to advance their own position relative to, or at the expense and exclusion of, other marginalized groups.Instead, those whose gatherings helped galvanize the push for full equality understood that “[a] diverse origin does not disprove a common nature, nor does it disprove a united destiny.” The firmest foundation for freedom would require an anticaste reset—“both for his sake and for ours”—and would benefit all.

During his U. S. Senate candidacy, Abraham Lincoln developed a similar vision. In the lead-up to the now-famous Lincoln-Douglas debates, Lincoln explained that the promise of liberty and equality in the Declaration of Independence “was held sacred by all, and thought to include all.” Lincoln expressly and intentionally linked the fate of Black Americans and immigrant groups (“among us perhaps half our people who are not descendants at all” of the Founders), and noted that the Nation’s future hinged on a universal definition of citizenship that excluded neither. He explained that the Declaration’s promise that “all men are created equal” was the “electric cord … that links the hearts of patriotic and liberty-loving men together,” regardless of race or descent.

The case was made. First, there was war. And then, the delegates’ (and Lincoln’s) universalist view of citizenship made its mark on the Constitution.
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Chris Murphy @chrismurphyct.bsky.social · 30/06/2026
Just shocking this was a 5-4 ruling. This Court is so so badly broken.
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NSF–DOE Rubin Observatory @rubinobservatory.org · 30/06/2026
The moment we've all been waiting for is finally here… On June 29, 2026, NSF–DOE Rubin Observatory officially began the Legacy Survey of Space and Time (LSST)! 🔭🧪☄️🌌 🔗: rubinobservatory.org/news/action-...
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Headquarters @headquartersnews.bsky.social · 30/06/2026
Rep. Casar: While we won the case today, we got a warning about the future. What should have been a simple, unanimous, open and shut decision was dangerously close. Clarence Thomas, Neil Gorsuch, Samuel Alito, and Brett Kavanaugh failed to recognize the Constitutional right to birthright citizenship
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Science Magazine @science.org · 22/06/2026
Exclusive: The National Science Foundation is trimming this year’s budgets for hundreds of its traditional basic science programs by roughly 20% to 30%, even though its overall budget is down just 3%. scim.ag/4xY2KCm
science.org
Exclusive: NSF slashes research programs to support new tech initiative, insiders say
Unexpected shift in funds has meant sharp drop in grants this fiscal year
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Ava Polzin @avapolzin.bsky.social · 01/06/2026
Thank you!
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Ava Polzin @avapolzin.bsky.social · 01/06/2026
Thank you!!
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Ava Polzin @avapolzin.bsky.social · 01/06/2026
Thank you!! :)
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thank you! :)
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thank you! Have visited family in Detroit, but never really gotten to explore so maybe this is my chance :)
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thank you! And yes, totally agree that Renée is great!!
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thank you!
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thank you!
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thank you!!
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thanks!
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thank you!
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thank you! :)
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Ava Polzin @avapolzin.bsky.social · 31/05/2026
Thank you!!
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Ava Polzin @avapolzin.bsky.social · 30/05/2026
Also a good time for me to share that I’ll be at the University of Toronto for the next five(!!) years as a Dunlap Fellow, so very open to Toronto (or broader Ontario) recs!
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Ava Polzin @avapolzin.bsky.social · 30/05/2026
Yesterday 🍾 ⬜️ Miss ⬜️ Mrs. ⬜️ Ms. 🔳 Dr. My immense appreciation to my advisors @highzclouds.bsky.social and @grumpy1.bsky.social for the last four years of support and science! (And huge thanks to @alexji.bsky.social and Nick Gnedin for serving on my committee :)) 🧪🔭👩‍🔬
Woman standing between her PhD advisors overlooking the gothic buildings of the University of Chicago campus.Woman standing between her dissertation committee members overlooking part of the University of Chicago campus.
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Ethan Siegel @startswithabang.bsky.social · 28/04/2026
The challenge of celebrating Artemis II as NASA cuts loom With Artemis II, we sent humans back to the Moon for the first time in 54 years, breaking our the all-time distance record from Earth. But few are celebrating amid deep NASA and NSF cuts. bigthink.com/starts-with-... #space #astro #nasa
bigthink.com
The challenge of celebrating Artemis II as NASA cuts loom
NASA has just sent astronauts back to the Moon for the first time since 1972 with Artemis II. So why would we cut NASA and NSF science now?
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Katie Mack @astrokatie.com · 22/04/2026
A number of space science organizations offered support for Isaacman's nomination because he is a proponent of space exploration and claimed he would support science. But now that science is on the chopping block -- and human spaceflight isn't -- he is volunteering to give NASA the DOGE treatment.
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ESO @eso.org · 20/04/2026
This isn't a scene from #StarWars. What you're looking at is the Tarantula Nebula. While those beams come from the lasers installed on the telescopes that comprise our VLTI. But why are we sending lasers into the sky? Find out: www.eso.org/public/images/potw2616a 🔭 🧪 📷 A. Berdeu/ESO
An astronomical image featuring the backdrop of the dark night sky with a faint grey-blue speckle at the centre. The nebulous cloud has the shape of a four-leaf flower. Four orange laser beams are pointing to it.
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Michael Brown @mjibrown.bsky.social · 14/04/2026
"A large constellation such as SpaceX’s Orbital Data Center... would place thousands of satellites above naked-eye visibility threshold, comparable to the number of natural stars typically visible in a dark sky."
arxiv.org
Large or bright satellite constellations: Effects on observations, including on the background sky brightness
This study evaluates the effect of proposed constellations -- ranging from current deployments to mega-constellations and very bright reflector concepts -- on direct trail losses, diffuse background, ...
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European Space Agency @esa.int · 07/04/2026
✅ #Artemis II update: 'Earthset', 6 April 2026, and 'totality', 7 April, seen from lunar orbit, the Moon eclipses the Sun, a view few humans have ever witnessed (pics: NASA) 🔗 www.nasa.gov/gallery/jour... @exploration.esa.int l
On a black background of space, a blue and white Earth just before 'setting' behind the Moon, in foreground, seen from Artemis II, 6 April 2026Totality seen from lunar orbit, the Moon eclipses the Sun, revealing a view few humans have ever witnessed, a dark disc surrounded by a pale solar corona.
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European Space Agency @esa.int · 03/04/2026
😮 Awesome views from Day 2 of #Artemis II this morning. @exploration.esa.int @esaearth.esa.int
Spectacular high-resolution image of our home planet viewed through the Orion Crew Module window by the Artemis II astronauts as they continue their journey to the Moon on Flight Day 2, 3 April 2026 (pic: NASA) A full disc image of Earth, as seen from the Orion Crew Module. The planet is a pale blue, swirling with white clouds and glowing slightly lighter blue in place from reflected light. At lower left, a large brown landmass is Africa, with Spain and Portugal with twinkling lights where the planet curves. At top right, auroras glow in a thin green glow, just barely separated from the planet's surface. Earth is set against the black of space (pic: NASA/R.Wiseman)
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Ava Polzin @avapolzin.bsky.social · 01/04/2026
Oh no!! I’ve definitely seen April Fool’s papers shared as PDFs from people’s websites in the past for this exact reason :/
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Ava Polzin @avapolzin.bsky.social · 20/03/2026
AAS actually released some preliminary figures in the fall (it went out in a newsletter at the start of the year): aas.org/posts/news/2... Trends are very much consistent with what you found, of course, which is very much complementary to how/where the official stats are extrapolated.
aas.org
The Evolving Astronomy Job Market: Fall 2025 Update
The AAS Committee on Employment has compiled updated data from the AAS Job Register through October 2025, showing a modest year-over-year decline in job postings, with postdoctoral positions continuin...
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Dr. Jessie Christiansen @aussiastronomer.bsky.social · 08/03/2026
I hope everyone who checked out @hogg.bsky.social’s white paper on the implications of LLMs in astronomy and shared it across slack channels similarly perused and amplified this white paper of best practices for broadening participation in astronomy!
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Ava Polzin @avapolzin.bsky.social · 08/03/2026
Readily shareable "cheatsheets" that summarize both context and recommendations (not a substitute for reading the white paper itself, of course!) are available here: pictureanastronomer.github.io/whitepaper
pictureanastronomer.github.io
White Paper | Picture an Astronomer
University of Chicago Women's Board | Kavli Institute for Cosmological Physics
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Ava Polzin @avapolzin.bsky.social · 08/03/2026
Happy International Women's Day! Perfect time for me to (re)share our white paper on increasing the retention of women in professional astrophysics (really full of suggestions that broaden participation in academic science in general). arxiv.org/abs/2512.24465 🧪🔭☄️👩‍🔬
Cover of "Picture an Astronomer: Best Practices for Retaining Talent in Astrophysics", which features an illustration of a 19-year-old Vera Rubin looking through a telescope over a backdrop of a first light image of spiral galaxies from the Rubin Observatory.
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Josiah Hawthorne @josiahhawthorne.bsky.social · 16/01/2026
This is your reminder that Hungarian-Jewish scientist George de Hevesy dissolved two Nobel Prizes in aqua regia to keep them out of the hands of the Nazis. He then left the dissolved solution on his shelf and fled to Sweden. (After the war he un-dissolved the gold and the prizes were re-cast.)
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The StarXiv ✨ podcast @starxiv.bsky.social · 12/01/2026
Finally, Payel gave a quick shout out to what seems like an incredible piece of work recommending best practises for improving the situation for minorities in Astronomy. 🔭 ☄️ arxiv.org/abs/2512.24465
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The Atlantic @theatlantic.com · 10/01/2026
“The U.S. has led an unprecedented age of cosmic discovery. Now Trump is trying to bring that age to an end, and right at the moment when answers to our most profound existential questions finally seem to be within reach,” @rossandersen.bsky.social reports. theatln.tc/LThKw0kY
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